ICSE Board Question Based on Equation of a Straight Line Chapter of M.L Aggarwal for class10
A line has a y-intetrcept and it is parallel to a line.
You have to find the coordinates of the point where it cuts the x-axis.
This is the Question Number 11, Exercise 12.2 of M.L Aggarwal.
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Find the equation of a line, which has the y-intercept 4, and is parallel to the line 2x – 3y – 7 = 0. Find the coordinates of the point where it cuts the x-axis.
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Given line: 2x – 3y – 7 = 0
Its slope is,
3y = 2x – 7
y = (2/3) x – 7/3
⇒ m = 2/3
So, the equation of the line parallel to the given line will be 2/3
Also given, the y-intercept is 4 = c
Hence, the equation of the line is given by
y = mx + c
y = (2/3) x + 4
3y = 2x + 12
2x – 3y + 12 = 0
Now, when this line intersects the x-axis the y co-ordinate becomes zero.
So, putting y = 0 in the line equation, we get
2x – 3(0) + 12 = 0
2x + 12 = 0
x = -12/2 = 6
Hence, the co-ordinates of the point where it cuts the x-axis is (-6, 0).